Bio Spot Spot On Flea & Tick Control for Dogs contains both an insecticide to kill and repel adult fleas, ticks, and mosquitoes up to 30 days, AND a long lasting insect growth regulator (IGR) to prevent flea eggs from developing into biting adults. It works against BOTH adult fleas and flea eggs, as well as ticks and mosquitoes, all in an easy to apply, spot-on dispenser. For dogs and puppies 6 months of age or older weighing under 15 lbs. only. Do not use on cats. Shipping weight: 1/6 lb.